:unhide

This command and :hide affect
the behavior of :zoom. They allow
the user to declare that certain frames should not be printed when the
stack is displayed by :zoom. To :hide a frame means that :zoom will not show it, and to :unhide a frame means that :zoom will show it. The objects which can
be hidden are functions named by specific symbols, all functions named
by symbols in a package, and all frames of a given type.

:unhide called with no
arguments causes the list of hidden objects to revert to the default
set of hidden objects (which is given below). Note that if you want to
see all frames in the stack, you should call :zoom with a true value
for the all argument. :unhide itself is not designed to unhide
all frames.

The function-name argument, if supplied, names a function
that is to be unhidden.

The frame-type argument, if supplied, names the type of
frames that are to be unhidden. The four valid frame types are: